Water Softener For Hard Water And ScaleContentsInternal Threaded Tap Diverter Adaptor 905 SmallWaterways 1665 2750 Water SoftenerHard Water Areas: (whole Hardness (th) >a Hundred And Twenty PpmStandard System With Water SoftenerSingle Under Sink Water Filter SystemsWater FiltrationA water softener exchanges calcium and magnesium with sodium to redu